Materials Literature
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Compounds containing a viologen linked to a porphyrin via a number (n= 4–7) of methylene groups have been synthesized and photoinduced long-range electron transfer between porphyrin and viologen was observed. The photoexcited singlet state of the porphyrin was quenched by the bonded viologen in viologen-linked porphyr…
Abstract Copolyimides with siloxane moieties in the main chain were synthesized by solution polycondensation of 1,3‐bis(3‐aminopropyl) tetramethyldisiloxane (APMS), oxydianiline (ODA) with 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride (BTDA) in N ‐methyl‐2‐pyrrolidone (NMP). The adhesion properties between copoly…
Tantalum Boride powders were synthesized by the solid state reaction between tantalum and amorphous boron. Five Boride phases (Ta2B, Ta3B2, TaB, Ta3B4 and TaB2) were formed by heat treatment of the mixed powders at 1000°-1800°C for 0-120min. Formation behavior of these borides was dependent on the heat-treatment tempe…
In the course of severe light water reactor (LWR) core melt accidents, the formation and presence of water soluble compounds will affect the behavior of fission products in the primary system and in the containment. A liquid aerosol mixed with an insoluble component has an affinity to stick on surfaces. A relocation o…
Abstract The phase transition from cellulose to alkali cellulose (Na‐Cell) and the phase structure of Na‐Cell have been investigated by CP/MAS 13 CNMR spectroscopy. It has been found from the 13 CNMR spectra that both crystalline and noncrystalline components of cellulose decrease in resonance intensities in the trans…
A quantitative comparison between theory and experiment is presented for the thermoelectric power of n-type Si at low temperatures, where crystal boundary scattering of phonons is predominant. The expression for the Seebeck coefficient is obtained by simultaneously solving the coupled Boltzmann equations for electrons…
Continuous ceramic fibres have many unique properties, including high-temperature durability and high elastic modulus. Their properties make them particularly valuable for use in metal and ceramic composites for automotive, aerospace, and heat-management structural applications. This paper reviews the various fabricat…
AbstractAfter discharge from the reactor and transport to Sellafield, irradiated nuclear fuels are stored in water filled ponds before being reprocessed. BNFL has established fuel management strategies and a pond water chemistry which ensures minimal corrosion of stored fuels. BNFL's materials selection policy for its…
Abstract This article examines the embrittlement of iron and carbon steels. It describes compositional, processing, and service conditions that contribute to the problem and presents examples of how embrittlement influences mechanical properties. Embrittlement due to hydrogen is the most common form of embrittlement a…
The tinted weldments of stainless steels were investigated on their corrosion behavior in aqueous chloride solution. The oxide scale formed on the simulated HAZ of SUS316L was studied by suface analysis techniques. Generally, the pitting resistance of the HAZ with the scale was deteriorated compared with ones whose sc…
The dynamic performance characteristics of polyphase hysteresis motors are presented. A mathematical model to predict the starting and synchronization process of such motors under various operating conditions is given. The model offers a tool for studying the dynamic stability of the hysteresis motor for small-scale d…
Abstract Three distinct peaks at 80, 175, and 325°C were identified in the dynamic derivative TGA curves of PMVEMA and PMVEMAC at a 10°C/min heating rate. These peaks were attributed to free water removal, anhydride formation, and polymer degradation, respectively. The kinetics of the anhydride formation were studied…
Abstract The paper compares the overall performance of a wide range of numerical procedures that can be used to integrate through the thickness of plates and shells. Results are presented for the accuracy of the calculations when there are discontinuities in the stress through the depth of the plate, and the available…
Sintering of CuO compacts has been studied and the basic mechanical properties of polycrystalline CuO have been determined. Specimens of 90% density can be fabricated by sintering CuO powder at 1010C for ~24hr. From data for 85-90%-dense specimens, the following elastic properties have been calculated for 100%-dense s…
Lead niobates with tungsten bronze-type crystal structure have been employed as photocatalysts, and the additive effects of potassium upon the photocatalytic activity for the production of hydrogen from water and upon the photovoltaic properties have been studied. With the addition of K, the photocatalytic activity in…
Infrared hydroxyl librational bands of talc-willemseite solid solutions (Mg–Ni talcs) have been explained by analogy with those of amphiboles. Two OH librational bands at 710 and 668 cm−1 appear in talc-willemseite solid solutions, because the degeneracy of a single OH librational vibration in talc and willemseite end…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a paramagnetic osmium-ruthenium double bondJames P. Collman and James M. GarnerCite this: J. Am. Chem. Soc. 1990, 112, 1, 166–173Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 Januar…
The synthesis, characterization, electrochemical properties, and preliminary X-ray structural data of the title electron donor, a hybrid of bis(ethylenedithio)tetrathiafulvalene and bis(ethylenedioxy)tetrathiafulvalene, are presented.
A new binuclear complex [Cu2(dien)2(OH)(ClO4)3](dien = diethylenetriamine) has been synthesized and its crystal and molecular structure determined by X-ray diffraction. It crystallizes in the monoclinic space group P21, with Z= 2, a= 11.896(7), b= 9.424(3), c= 11.468(7)Å, and β= 117.97(4)°. The structure consists of d…
Mimetite Pb 5 (AsO 4 ) 3 Cl, M = 1488.21 Daltons, space group P 6 3 / m , a = 10.250(2), c = 7.454(1) Å, U = 678.214(2) Å 3 , Z = 2, D calc = 7.26 g cm −3 , λ = 1.237 Å, μ (neutron) = 2.85 cm −1 . The structure of the lead chloroarsenate mineral, mimetite, an isomorph of apatite, was refined using single crystal neutr…